If I had one complaint on the BUSA kits, it is the complete lack of organization when they pack the kit. It is no surprise there are missing parts, because I think they just look at the stock list and throw the items in the box! The first thing I did with my new tripe kit was organize and mark all of the stock. I still ended up cutting a couple of the wrong sticks at the wrong time.
The other thing to watch, the L.E. sheet stock, and spar stock, for the tripe, is too short to do an adequate scarf joint for length. They really should go up to the next length of stock so this can be done properly. Care must be taken there. In the end, they build into fabulous models, but they could be a little bit easier if some things were done differently. I have built 2 tripes and the Fokker DVII.